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                                <h2 id="&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;event-flags">&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;(Event Flags)</h2><p>&#x4E8B;&#x4EF6;&#x4F4D;(<code>Event Bits</code>)&#x88AB;&#x7528;&#x6765;&#x6807;&#x5FD7;&#x67D0;&#x4E2A;&#x4E8B;&#x4EF6;&#x53D1;&#x751F;&#x4E0E;&#x5426;&#x3002;&#x4E8B;&#x4EF6;&#x4F4D;&#x4E5F;&#x88AB;&#x79F0;&#x4E3A;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x3002;&#x4E3E;&#x4E2A;&#x6817;&#x5B50;&#xFF0C;&#x6BD4;&#x5982;&#x67D0;&#x4E2A;bit&#x4E5F;&#x5C31;&#x662F;&#x67D0;&#x4E2A;&#x6807;&#x5FD7;&#x4EE3;&#x8868;&#x5F53;&#x524D;&#x662F;&#x5426;&#x9700;&#x8981;&#x5237;&#x65B0;LCD&#x4E0A;&#x7684;&#x5185;&#x5BB9;&#xFF0C;&#x5982;&#x679C;&#x7F6E;&#x4F4D;&#x5219;&#x9700;&#x8981;&#x5237;&#x65B0;&#xFF0C;&#x6E05;&#x7A7A;&#x5219;&#x4E0D;&#x9700;&#x8981;&#x3002;&#x5F53;&#x8BE5;&#x6807;&#x5FD7;&#x88AB;&#x7F6E;&#x4F4D;&#x65F6;&#xFF0C;&#x4EFB;&#x52A1;&#x8FDB;&#x884C;LCD&#x4E0A;&#x7684;&#x5185;&#x5BB9;&#x5237;&#x65B0;&#x3002;</p><h2 id="&#x4E8B;&#x4EF6;&#x7EC4;">&#x4E8B;&#x4EF6;&#x7EC4;</h2><p>&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x7684;&#x96C6;&#x5408;&#x3002;&#x6BCF;&#x4E00;bit&#x4EE3;&#x8868;&#x67D0;&#x4E2A;&#x4E8B;&#x4EF6;&#x3002;</p><h2 id="&#x4E8B;&#x4EF6;&#x7EC4;&#x548C;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x6570;&#x636E;&#x7C7B;&#x578B;">&#x4E8B;&#x4EF6;&#x7EC4;&#x548C;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x6570;&#x636E;&#x7C7B;&#x578B;</h2><p>&#x4E8B;&#x4EF6;&#x7EC4;&#x5F15;&#x7528;&#x7684;&#x53D8;&#x91CF;&#x7C7B;&#x578B;&#x5B9A;&#x4E49;&#x4E3A;<code>EventGroupHandle_t</code>,&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;&#x4F4D;&#x6570;&#x7531;<code>configUSE_16_BIT_TICKS</code>&#x51B3;&#x5B9A;&#xFF0C;&#x5F53;&#x8BBE;&#x7F6E;&#x4E3A;1&#x65F6;&#xFF0C;&#x4E8B;&#x4EF6;&#x7EC4;&#x4E3A;8bit&#xFF0C;&#x8BBE;&#x7F6E;&#x4E3A;0&#x65F6;&#xFF0C;&#x4E8B;&#x4EF6;&#x7EC4;&#x4E3A;24bit&#x3002;(&#x8FD9;&#x4E2A;&#x5B8F;&#x5B9A;&#x4E49;&#x5B9E;&#x9645;&#x4E0A;&#x662F;&#x7528;&#x6765;&#x5B9A;&#x4E49;<code>TickType_t</code>&#x7684;&#x4F4D;&#x6570;&#x7684;&#xFF0C;&#x4E0D;&#x77E5;&#x9053;&#x4E3A;&#x4EC0;&#x4E48;&#x4F1A;&#x62FF;&#x6765;&#x5B9A;&#x4E49;&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;&#x4F4D;&#x6570;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x518D;&#x8BBE;&#x8BA1;&#x4E00;&#x4E2A;&#x5B8F;&#x4E13;&#x95E8;&#x5B9A;&#x4E49;&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;&#x4F4D;&#x6570;)&#x3002;</p><p>&#x4E0B;&#x56FE;&#x662F;&#x4E00;&#x4E2A;24bit&#x7684;&#x4E8B;&#x4EF6;&#x7EC4;&#xFF0C;&#x5305;&#x542B;3&#x4E2A;&#x4E8B;&#x5148;&#x5B9A;&#x4E49;&#x597D;&#x7684;&#x4E8B;&#x4EF6;&#xFF0C;bit2&#x88AB;&#x7F6E;&#x4F4D;&#x3002;</p><p><img alt="24-bit Event Group" src="http://www.freertos.org/24-bit-event-group.gif"></p><h2 id="&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;rtos-api&#x51FD;&#x6570;">&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;RTOS API&#x51FD;&#x6570;</h2><p>&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;API&#x51FD;&#x6570;&#x5141;&#x8BB8;&#x4EFB;&#x52A1;&#x6216;&#x8005;&#x5176;&#x4ED6;&#x6765;&#x7F6E;&#x4F4D;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#xFF0C;&#x6216;&#x8005;&#x6E05;&#x7A7A;&#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x3002;&#x6216;&#x8005;&#x963B;&#x585E;&#x4EFB;&#x52A1;&#x76F4;&#x5230;&#x4E8B;&#x4EF6;&#x7EC4;&#x4E2D;&#x7684;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x7F6E;&#x4F4D;&#x3002;</p><p>&#x4E8B;&#x4EF6;&#x7EC4;&#x540C;&#x6837;&#x53EF;&#x4EE5;&#x7528;&#x6765;&#x540C;&#x6B65;&#x3002;creating what is often referred to as a task &apos;rendezvous&apos;. A task synchronisation point is a place in application code at which a task will wait in the Blocked state (not consuming any CPU time) until all the other tasks taking part in the synchronisation also reached their synchronisation point.</p><h2 id="&#x4F7F;&#x7528;&#x4E8B;&#x4EF6;&#x7EC4;&#x5FC5;&#x987B;&#x514B;&#x670D;&#x7684;&#x95EE;&#x9898;">&#x4F7F;&#x7528;&#x4E8B;&#x4EF6;&#x7EC4;&#x5FC5;&#x987B;&#x514B;&#x670D;&#x7684;&#x95EE;&#x9898;</h2><p>&#x5728;&#x4F7F;&#x7528;&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x4E3B;&#x8981;&#x6709;&#x4E24;&#x65B9;&#x9762;&#x7684;&#x6311;&#x6218;&#x5FC5;&#x987B;&#x514B;&#x670D;&#xFF1A;</p><h3 id="&#x907F;&#x514D;&#x5728;&#x7528;&#x6237;&#x5E94;&#x7528;&#x4E2D;&#x521B;&#x5EFA;&#x7ADE;&#x4E89;&#x6761;&#x4EF6;">&#x907F;&#x514D;&#x5728;&#x7528;&#x6237;&#x5E94;&#x7528;&#x4E2D;&#x521B;&#x5EFA;&#x7ADE;&#x4E89;&#x6761;&#x4EF6;</h3><p>&#x4E8B;&#x4EF6;&#x7EC4;&#x4F1A;&#x5728;&#x4EE5;&#x4E0B;&#x60C5;&#x51B5;&#x521B;&#x5EFA;&#x7ADE;&#x4E89;&#x6761;&#x4EF6;&#xFF1A;</p><ul><li>&#x5BF9;&#x4E8E;&#x6E05;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x6CA1;&#x6709;&#x4E00;&#x4E2A;&#x660E;&#x786E;&#x7684;&#x804C;&#x8D23;&#x5206;&#x914D;
</li>
<li>&#x5BF9;&#x4F55;&#x65F6;&#x6E05;&#x65F6;&#x95F4;&#x6807;&#x5FD7;&#x4E0D;&#x660E;&#x786E;
</li>
<li>&#x5728;&#x4EFB;&#x52A1;&#x6D4B;&#x8BD5;&#x5B8C;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x5E76;&#x9000;&#x51FA;&#x65F6;&#xFF0C;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x662F;&#x88AB;&#x6E05;&#x7A7A;&#x8FD8;&#x662F;&#x7F6E;&#x4F4D;&#x4E0D;&#x660E;&#x786E;
</li></ul>
<p>freeRTOS&#x7684;&#x4E8B;&#x4EF6;&#x7EC4;&#x5B9E;&#x73B0;&#x6D88;&#x9664;&#x4E86;&#x8FD9;&#x79CD;&#x6F5C;&#x5728;&#x7684;&#x7ADE;&#x4E89;&#x6761;&#x4EF6;&#x7684;&#x4EA7;&#x751F;&#xFF0C;&#x901A;&#x8FC7;&#x667A;&#x80FD;&#x7684;&#x5EFA;&#x7ACB;&#x786E;&#x4FDD;&#x7F6E;&#x4F4D;&#x3001;&#x6D4B;&#x8BD5;&#x3001;&#x6E05;&#x9664;&#x662F;&#x539F;&#x5B50;&#x64CD;&#x4F5C;&#x3002;&#x7EBF;&#x7A0B;&#x7684;&#x672C;&#x5730;&#x5B58;&#x50A8;&#x4EE5;&#x53CA;&#x8C28;&#x614E;&#x4F7F;&#x7528;API&#x51FD;&#x6570;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x4F7F;&#x5F97;&#x8FD9;&#x53D8;&#x5F97;&#x53EF;&#x80FD;&#x3002;</p><h3 id="&#x907F;&#x514D;&#x4E0D;&#x786E;&#x5B9A;&#x6027;">&#x907F;&#x514D;&#x4E0D;&#x786E;&#x5B9A;&#x6027;</h3><p>&#x4E8B;&#x4EF6;&#x7EC4;&#x7684;&#x6982;&#x5FF5;&#x610F;&#x5473;&#x8FD9;&#x4E0D;&#x786E;&#x5B9A;&#x7684;&#x884C;&#x4E3A;&#xFF0C;&#x56E0;&#x4E3A;&#x4E0D;&#x77E5;&#x9053;&#x5728;&#x4E00;&#x4E2A;&#x4E8B;&#x4EF6;&#x7EC4;&#x4E0A;&#x6709;&#x591A;&#x5C11;&#x4EFB;&#x52A1;&#x88AB;&#x963B;&#x585E;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x4E5F;&#x4E0D;&#x77E5;&#x9053;&#x5F53;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x7F6E;&#x4F4D;&#x65F6;&#x5019;&#xFF0C;&#x4E5F;&#x4E0D;&#x77E5;&#x9053;&#x9700;&#x8981;&#x6D4B;&#x8BD5;&#x591A;&#x5C11;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x4F4D;&#x6216;&#x8005;&#x963B;&#x585E;&#x4EFB;&#x52A1;&#x3002;</p><p>freeRTOS&#x7684;&#x8D28;&#x91CF;&#x6807;&#x51C6;&#x4E0D;&#x5141;&#x8BB8;&#x4E0D;&#x786E;&#x5B9A;&#x7684;&#x884C;&#x4E3A;&#x5728;&#x4E2D;&#x65AD;&#x7981;&#x7528;&#x6216;&#x8005;&#x4E2D;&#x65AD;&#x670D;&#x52A1;&#x4E2D;&#x53D1;&#x751F;&#x3002;&#x4E3A;&#x4E86;&#x786E;&#x4FDD;&#x8FD9;&#x4E2A;&#x4E25;&#x683C;&#x7684;&#x8D28;&#x91CF;&#x6807;&#x51C6;&#x5728;&#x4E8B;&#x4EF6;&#x6807;&#x5FD7;&#x7F6E;&#x4F4D;&#x65F6;&#x4E0D;&#x88AB;&#x6253;&#x7834;&#xFF0C;&#x9700;&#x8981;&#x4EE5;&#x4E0B;&#x4E24;&#x70B9;&#xFF1A;</p><ul><li><p>The RTOS scheduler&apos;s locking mechanism is used to ensure interrupts remain enabled when an event bit is set from an RTOS task.</p></li>
<li><p>The centralised deferred interrupt mechanism is used to defer the action of setting a bit to a task when an attempt is made to set an event bit from an interrupt service routine.</p></li></ul>
<h2 id="&#x5B9E;&#x4F8B;&#x4EE3;&#x7801;">&#x5B9E;&#x4F8B;&#x4EE3;&#x7801;</h2><p>&#x76F8;&#x5173;&#x7684;&#x5B9E;&#x4F8B;&#x4EE3;&#x7801;&#x53CA;&#x6587;&#x6863;&#x4FDD;&#x5B58;&#x5728;&#x8DEF;&#x5F84;<code>FreeRTOS/Demo/Common/Minimal</code>&#x4E0B;&#x7684;<code>EventGroupsDemo.c</code>&#x6587;&#x4EF6;&#x4E2D;&#x3002;</p>
                                
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